marble » marball

From Estel Telcontar in e-mail, 28 November 2004, among eggcorns produced by his younger brother:

[at the age of 10 or 11] “marball” is pronounced slightly differently than “marble” - the final syllable I think has secondary stress, and the vowel is that in “ball”. Again, when I talked to him about this (a few years ago), he was surprised to find out that it wasn’t actually “marball” - he’d always thought it was, because marbles are a kind of ball.